Bromus danthoniae

Trin. ex C.A. Mey.
Common names: Three-awned brome
Treatment appears in FNA Volume 24. Treatment on page 233.
Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché

Copyright: Utah State University

Plants annual. Culms 5-40 cm, erect or ascending. Sheaths glabrous or pubescent; ligules 1.2-2.6 mm, puberulent, obtuse, laciniate; blades 2-15 cm long, 2-5 mm wide, pubescent on both surfaces. Panicles 2-12 cm long, 1-5 cm wide, dense, ovoid, stiffly erect, sometimes racemose; branches shorter than the spikelets, ascending, slightly curved or straight. Spikelets 10-40 (45) mm long, 4-10 mm wide, lanceolate to elliptic or oblong, laterally compressed; florets 5-8 (10), bases concealed at maturity; rachilla internodes concealed at maturity. Glumes glabrous or pubescent; lower glumes 5-8.5 mm, 3-5-veined, lanceolate; upper glumes 6.5-9.5 mm, 7-9 (11) -veined, elliptic; lemmas 8-12 (13.5) mm long, 6-7 mm wide, oblanceolate, veins glabrous, scabridulous, or ciliolate, glabrous or pubescent elsewhere, 9-11-veined, rounded over the midvein, margins broadly hyaline, bluntly angled above the middle, not inrolled at maturity, apices subulate to acute or obtuse, toothed, teeth shorter than 1 mm; awns usually 3 on the upper lemmas in each spikelet, arising 2-4 mm below the lemma apices, purple or deep red, central awn 5-25 mm, flattened at the base, divaricate and sometimes twisted at maturity, lateral awns 4-10 mm, erect or reflexed, sometimes absent or much reduced on the lower lemmas; anthers 1-1.8 mm. Caryopses equaling or shorter than the paleas, thin, weakly inrolled or flat. 2n = 14.

Discussion

Bromus danthoniae is native from the western Asia to southern Russia and Tibet. It was collected in 1904 in Ontario; no other North American collections are known.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Bromus danthoniae"
membranous +  and scarious +
0.1 cm1 mm <br />0.001 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
awned +  and entire +
toothed +, subulate +  and acute or obtuse +
Leon E. Pavlickf +
Trin. ex C.A. Mey. +
divaricate +
3 (?) +  and 0 (?) +
red;deep;purple +
flexuous +  and straight +
distinct +
subterminal +  and terminal +
geniculate +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
2 cm20 mm <br />0.02 m <br /> (15 cm150 mm <br />0.15 m <br />) +
not evident +
cross +, linear +  and narrowly lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
straight +  and curved +
spikelike +
reflexed +  and erect +
0.5 cm5 mm <br />0.005 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
Three-awned brome +
not branching +
ascending +  and erect +
5 cm50 mm <br />0.05 m <br /> (40 cm400 mm <br />0.4 m <br />) +
not woody +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
5 +  and 8 +
terete +  and laterally compressed +
1-9(11)-veined +
always shorter +  and usually shorter +
lanceolate +
subtending +
pubescent +  and glabrous +
mucronate +  and acute +
unequal +
uncinate +
solid +  and hollow +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
pubescent +  and glabrous +
oblanceolate +
herbaceous +  and coriaceous +
6mm +  and 7mm +
laciniate +  and obtuse +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.26 cm2.6 mm <br />0.0026 m <br />) +
membranous +
inconspicuous +
lanceolate +
fleshy +  and membranous +
0.5 cm5 mm <br />0.005 m <br /> (0.85 cm8.5 mm <br />0.0085 m <br />) +
concealed +  and prominent +
2 +  and 1 +
hairy +  and glabrous +
well-developed +
reduced +
2cm +  and 12cm +
1 cm10 mm <br />0.01 m <br /> (5 cm50 mm <br />0.05 m <br />) +
dry +  and fleshy +
pubescent +  and glabrous +
converging +  and parallel +
1 cm10 mm <br />0.01 m <br /> (4 cm40 mm <br />0.04 m <br />) +
1 +  and 60 +
not viviparous +
compressed +, lanceolate +  and elliptic or oblong +
0.5 cm5 mm <br />0.005 m <br /> (7 cm70 mm <br />0.07 m <br />) +
4mm +  and 10mm +
1 +  and 3 +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Bromus danthoniae +
Bromus sect. Bromus +
species +
membranous +
1 cm10 mm <br />0.01 m <br /> (?) +
0.65 cm6.5 mm <br />0.0065 m <br /> (0.95 cm9.5 mm <br />0.0095 m <br />) +
9-11-veined +
pubescent +, glabrous +  and ciliolate +
scabridulous +
rounded +
aquatic +  and terrestrial +